Ammonia Leaching: A New Approach of Copper …
Leaching of copper from tailings using ammonia–ammonium chloride solution and its dynamics Ammonia– ammonium chloride Leaching time, the concentration of ammonia, solid/ liquid ratio and ...
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Leaching of copper from tailings using ammonia–ammonium chloride solution and its dynamics Ammonia– ammonium chloride Leaching time, the concentration of ammonia, solid/ liquid ratio and ...
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The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were …
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The dissolution of copper during the leaching of chalcopyrite in ammonia solutions is an attractive alternative to acid sulfate leaching in the treatment of ores with high consumption of acid. Despite considerable research into this complex leaching system, a lack of understanding of the fundamental chemical drivers has delayed the ...
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Heap leaching generates a pregnant leach solution (PLS) containing 1–6 g/L Cu²⁺, which is sent to solvent extraction and electrowinning for copper production.
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Controlling thiosulfate and oxygen concentration is also critical to the gold leaching process in copper-ammonia-thiosulfate solutions [73,75]. ... system will produce a large amount of wastewater and tailings containing ammonia or ammonium, which may cause great damages to the surrounding environment. ... system for leaching gold …
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The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and ...
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The main important parameters in ammonia leaching of copper tailings have been prioritized as solid/liquid ratio, leaching time, temperature and the concentration of ammonia. The optimum leaching conditions are found to be: 4/1 liquid/solid ratio, 4h …
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The current study investigated a hybrid approach using aqueous ammonia as a pH modifier for glycine-based lixiviant systems to leach copper from chalcopyrite while maintaining surface...
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An alternative system to cyanide as a leaching agent is presented for the recovery of gold and silver from cyanicide minerals. These minerals are characterized by the presence of copper and carbonaceous minerals in their composition, therefore increasing both the consumption of reagents and energy requirements for the …
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Abstract. The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings …
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Selective extraction of copper from tailings was successively investigated by Turan et al. [21] using a mixture of ammonia salts as leaching reactants and managed to obtain a copper recovery of 91 ...
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that copper could be selectively recovered from tailings. Keywords Copper .Extraction .Tailings .Leaching .Ammoniasalts 1 Introduction Copper production methods vary based on the characteristics of the ore that is used as the raw material. In general, pyro-metallurgical methods are used for sulfur-containing copper
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from Flotation Tailings Using Glycine-Ammonia Solutions in the Presence of Permanganate Huan Li, Elsayed Oraby, Jacques Eksteen and Tanmay Mali Special Issue ... [11], glycine solution could selectively leach copper over gold as cupric glycinate (Cu(Gly)2) from gold–copper concentrate at room temperature and with a pH of …
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Based on previous studies on chalcopyrite leaching [17,18], the examples of copper dissolution in this study may be represented as shown in Reactions (6) glycine and (7), which explain the improvement sively reported that both ammonia and can leach copper efficiently by complexa-of copper 2+ or Cu(NH3)42+) and copper glycinate (Cu(Gly)2 ...
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By addition of ammonia and oxygen, metallic copper and copper oxides are Fig. 3 Ammonia leaching of tailings (leaching time 120 min, solid/liquid ratio 1/10, a 20 °C; b 30 °C; c 40 °C; d 50 °C; e 60 °C) Mining, Metallurgy & Exploration As seen in the figure, with the increased concentration of ammonium hydroxide, there was a significant ...
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This work aims a novel approach, analogous to LPF, but with specific differences that include leaching with ammonia instead of acid, keeping alkaline pH …
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Ammonia and ammonium salts have been recognized as effective leaching agents in hydrometallurgical processes due to low toxicity and cost, easy recovery and high selective recovery of metals. New research findings on considerable advantages of leaching by these agents and elimination of problems associated with acid leaching …
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Minerals 2022, 12, 612 3 of 12 ores. The study showed that 85.1% of gold was dissolved into leachate from different ores by leaching with glycine (1.5 kg/t) and potassium permanganate (3 kg/t) for ...
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In pyrometallurgical processes refining copper, the main source of loss in the conversion stage is from slag. This paper reports on research work treating converter slag containing high percentages of copper (36 wt%) using ammonium hydroxide at room temperature. Variables analyzed are solution pH, agitation, temperature, NH4OH …
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The recycling of Cu from WPCBs has attracted increasing attention during the last two decades [5,6]. As a more sustainable process, ammonium salts ((NH 3 ) 2 SO 4, (NH 3 ) 2 CO 3 and NH 4 Cl) and ...
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Thus, in this study, to recover valuable metals and reduce pollution, a cleaner metal extraction method from copper sulfide tailings using a combined leaching …
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Ammonia leaching primarily relies on the complexation of NH 3 with Ni 2+ and Co 2+ to generate stable ammonia complexes Ni(NH 3) 6 2+ and Co(NH 3) 6 3+ [23], [24]. Therefore, it is commonly used as a powerful reagent for the selective leaching of Ni and Co from materials that contain those metals as a result [25].
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The comparison of leaching with alkaline bacteria, ammonia, or their combination undoubtedly shows that copper recovery is significantly higher when combined with an increase in Cu extraction ...
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Thus, in this study, to recover valuable metals and reduce pollution, a cleaner metal extraction method from copper sulfide tailings using a combined leaching method employing ammonia solution and a novel strain of alkaline bacteria under alkaline condition was explored. The phylogenetic tree of a novel strain of alkaline bacteria isolated from ...
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Copper leaching from ore using ammonia should be followed by selective extraction of copper using the extraction agent in the solvent extraction process. LIX63 …
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$&&(37('0$186&5,37 Character number:5744 Copper recycle from sulfide tailings using combined leaching of ammonia solution and alkaline bacteria Shenghua Yina,b, Leiming Wanga,b,*, Aixiang Wub, Eugie Kabwec, Xun Chen a, Rongfu Yan b a Key Laboratory of the Ministry of Education of China for High-Efficient Mining and Safety of Metal Mines, …
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The tests used in the physical characterization of the copper tailings using standard methods are specific gravity (Pycnometer test), residual moisture content (Gravimetric method), loss on ignition ... Only Cu extraction yields at 90 min using ammonia leaching were slightly comparable to H 2 SO 4 leaching at pH 3. All the other recoveries ...
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Sulfidic copper–lead–zinc tailings can pose a significant environmental threat, ranging from generation of acid mine drainage (AMD) to dam failures. On the other hand, they can also be considered as low-grade ore resources for zinc and copper provided that novel economically feasible metal extraction and metal recovery …
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The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%. Effects of lixiviant …
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Wu Heng-shan and some other investigators have made leaching experiments of copper tailings by using acid and ammonia separately and shown the feasibility of secondary recovery of copper tail-ings[2]. However, the period of leaching required in their studies is so long that it cannot be a satisfactory solution in the process …
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The leaching of copper from the tailings of Baifang Copper Mine in Hunan province in China by aqueous ammonia/ammonium chloride solutions has been studied. The tailings belong to a low-grade and high-alkaline copper ore. The effect of leaching time, the concentration of ammonia, solid/liquid ratio and temperature were investigated. The …
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Copper Leaching - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This document reviews ammonia leaching in the copper industry. It provides a brief history of ammonia leaching, including some of the earliest industrial applications in the early 20th century. It also summarizes a few notable processes developed over time, …
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The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate solution. The main parameters, such as ammonia and ammonium sulphate concentrations, particle size, solid-to-liquid ratio and reaction temperature, were chosen in the experiments. The results show that the increase of …
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Article: Copper recycle from sulfide tailings using combined leaching of ammonia solution and alkaline bacteria
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DOI: 10.1016/j.mineng.2023.108418 Corpus ID: 263281019; Selective extraction of nickel and cobalt from disseminated sulfide flotation cleaner tailings using alkaline glycine-ammonia leaching solutions
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In this process, ammonia leaching of sulfide minerals of copper, nickel, cobalt and iron was conducted at a temperature of about 105°C and air pressure of 8 ATM.
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A comparison between using ammonia and sodium hydroxide as pH modifiers was conducted and the leaching performance of glycine-ammonia has been found to be superior based on both metal extractions and leaching kinetics. The use of resin-in-leach (RIL) to recover Ni and Co from glycine-ammonia leaching solution …
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In this process, ammonia leaching of sulfide minerals of copper, nickel, cobalt and iron was conducted at a temperature of about 105 C and air pres-sure of 0.8 MPa. Under …
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The experiments of agitation leaching were carried out in aqueous ammonia/ammonium carbonate solution, to recover copper from the flotation tailings of waste copper oxide residue. The main copper minerals contained in the flotation tailings are chrysocolla, malachite, and cuprite, with the copper grade of 1.12%.
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